US Bridges

STC4784;FRENCH Mtn over Orofino Creek

Fair

Clearwater County, Idaho · 1.2 S. 0.1 E. Pierce · Structure no. 000000000029055

Built
1960
65 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
110
2023 count
Owner
Local
Other Local Agency

About this bridge

STC4784;FRENCH Mtn over Orofino Creek is a concrete tee beam carrying STC4784;FRENCH Mtn over Orofino Creek in Clearwater County, Idaho. It was built in 1960, so it is 65 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 110 vehicles a day, roughly 10% of them trucks, projected to reach 165 by 2042. The structure is 32 ft (9.8 m) long and 30 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSTC4784;FRENCH Mtn
CrossesOrofino Creek
Location1.2 S. 0.1 E. Pierce
RouteCounty Highway 4784
CountyClearwater County
StateIdaho
Coordinates46.47334, -115.79663
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic165 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4784;FRENCH Mtn over Orofino Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is STC4784;FRENCH Mtn over Orofino Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does STC4784;FRENCH Mtn over Orofino Creek carry?

About 110 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is STC4784;FRENCH Mtn over Orofino Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.

Who owns STC4784;FRENCH Mtn over Orofino Creek?

It is owned by the Other Local Agency.